No abstract

Rhodium(I) tris(pyrazolyl)borate complexes TpR2Rh(cod) (R = Me, Ph, i-Pr) were found to serve as efficient catalysts for highly stereoregular polymerization of phenylacetylene derivatives (p-YC6H4C⋮CH; Y = H, Me, Cl, CN, CO2Me, COMe, NO2) to give poly(phenylacetylene) species having a head-to-tail, cis-transoidal structure. The catalytic activity was strongly affected by the substituents (R) at the 3- and 5-positions of the pyrazolyl groups, and the more sterically demanding R groups led to higher catalytic activity.

No abstract

Some ruthenium(II) complexes of an alcohol ligand tethered to η6-arene group have been prepared. The alcohol-Ru chelate bond of the complexes containing an N,N′-chelate auxiliary was maintained in methanol. The Cl− ion cleaved the alcohol-Ru bond to give the Ru-Cl bond, while bases (OH−, RNH2) abstracted proton of OH bound to Ru affording the alkoxy chelate complex.

No abstract